UROCOPTIS OF JAMAICA. 139 



Var. RUBELLA (C. B. Adams). 



Related to P. cylindrus Desh., but the shell is smaller, 

 brighter red; spire more slender above; whorls lost 14, 8 re- 

 maining; lip thin, free from the penultimate whorl. Length 

 of truncated portion .43 inch; of remaining part .7, width .3 

 inch (C.B. A.). 



Pupa rubella C. B. A., Proc. Bost. Soc. N. H., ii, p. 15 

 (1845). Cylindrella rubella C. B. A., Contrib. to Conch., p. 

 39, no. 22 ; p. 183, no. 176. 



This form has never been properly defined, and its status 

 remains uncertain. Adams in his first Catalogue bracketed 

 rubella with cylindrus, and in the Catalogue of 1851 placed it 

 between cylindrus and zonata, in both cases separating it from 

 the so-called rosea group of forms. 



16. U. ZONATA (C. B. Adams). PI. 28, figs. 10-15; pi. 30, figs. 



55, 56. 



' ' Shell cylindric in the lower two-thirds, very robust ; pink 

 with a tinge of brown or purple, with a pearl-white zone along 

 the suture; pale brown in the aperture ; with an elegant silky 

 lustre produced by crowded, oblique, very fine striae. Spire 

 with the outlines convex in their upper half; apex truncate. 

 Whorls remaining 8, moderately convex, slightly margined on 

 the lower side, with a moderately impressed suture. Aperture 

 similar to that of C. rosea [ambigua], but more dilated in the 

 lower part of the left side, and with the lip less expanded. 

 Length 1.18, breadth .41 inch." (Adams) . 



Jamaica : Interior of the parishes Hanover, Westmoreland 

 and southwestern St. James. Map no. 2, area 12. 



Cylindrella zonata C. B. A., Contrib. to Conch., no. 9, p. 161 

 (April, 1851. PFR., Monogr., iii, p. 568; viii, p. 431. Sow- 

 ERBY, Conch. Icon., xx, pi. 2, f. 10 (1875). 



"It resembles C. cylindrus, but differs in always having a 

 white zone and in being often tinged with brown ; it is much 

 more robust. The aperture of C. cylindrus is more like that 

 of C. rosea than of this shell." (Adams). 



The internal pillar is moderately strong and nearly straight. 

 A similar white sutural border is occasionally present in U. 



